Hyperradiant Fresnel lens
Hyper-radial or hyperradiant Fresnel lenses are Fresnel lenses used in lighthouses. They are larger than "first order" lenses, having a focal length (radius) of 1330 mm (52.36 in.). The idea was mentioned by Thomas Stevenson in 1869 and first proposed by John Richardson Wigham in 1872, and again proposed by Thomas Stevenson in 1885 (infringing Wigham's patent). A quadriform system was used at Galley Head lighthouse, Co. Cork, which at over 1 million candlepower was the most powerful light in the world when installed in 1879.
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Hyperradiant Fresnel lens
Hyper-radial or hyperradiant Fresnel lenses are Fresnel lenses used in lighthouses. They are larger than "first order" lenses, having a focal length (radius) of 1330 mm (52.36 in.). The idea was mentioned by Thomas Stevenson in 1869 and first proposed by John Richardson Wigham in 1872, and again proposed by Thomas Stevenson in 1885 (infringing Wigham's patent). A quadriform system was used at Galley Head lighthouse, Co. Cork, which at over 1 million candlepower was the most powerful light in the world when installed in 1879.
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A Lente Hiper-Radiante de Fres ...... por Thomas Stevenson, em 1885.
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Hyper-radial or hyperradiant F ...... lenses of this size obsolete.
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A Lente Hiper-Radiante de Fres ...... por Thomas Stevenson, em 1885.
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Hyper-radial or hyperradiant F ...... world when installed in 1879.
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Hyperradiant Fresnel lens
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Lente Hiper-Radiante de Fresnel
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